Published:2011/8/13 1:14:00 Author:qqtang | Keyword: multi-meter, field intensity meter
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Published:2011/8/14 22:19:00 Author:qqtang | Keyword: PVDF, heart sounds, impulse measuring circuit
In the figure is the PVD heart sounds impulse measuring circuit. The circuit consists of the single steady oscillator(4538), frequency distributor (4024), pulse generator(ICM7555), counter (4040), storage(ROM), 7-stage lock storage drive(7511),7-stage digital LED and so on. In figure (a) is the PVDF heart sounds impulse sensor structure circuit. For figure (a), PVDF film is a dome shell and it sticks out, so it can contact the earth well. As the PVDF material is soft, which can cling to the skin, its impedance can couple with the skin. (View)
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Published:2011/8/14 22:29:00 Author:qqtang | Keyword: transistor character, curve plotter
In the figure is the transistor character curve plotter composed of 555. See as figure (a), the circuit consists of the sawtooth wave generator and step wave generator. As it needs two voltages to draw the transistor character, one is the step wave on the b pole, which generates different base currents lb; the other is the sawtooth wave on the c pole, whose period is corresponding to the step wave, so the output character curve of the transistor can be drawn out, i.e Ic-Vce character curve. The sawtooth generator consists of the oscillator (IC(555), R1, R2 and C1) and integral circuit (C2 and R3). (View)
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Published:2011/8/13 1:15:00 Author:qqtang | Keyword: power supply, expanded current
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Published:2011/8/13 1:16:00 Author:qqtang | Keyword: capacitor, selecting circuit
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Published:2011/8/14 22:38:00 Author:qqtang | Keyword: application circuit, single chip, phase difference, test system
The AD8302 application circuit is shown in the figure. R1 and R2 are the input terminals. R3 is the load of the UREF output terminal. C1 and C4 are the AC input coupling capacitor, C2 and C3 are the filtering capacitors, C5 and C6 are the power supply decoupling capacitors. S1 is the gain test pattern/comparator pattern selecting switch, by pulling S2 to gear a, the phase difference test pattern; when it is pulled to gear b, the comparator pattern is chosen, PSET terminal sets the voltage. (View)
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Published:2011/8/13 1:18:00 Author:qqtang | Keyword: microampere meter, internal resistance, test circuit
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Published:2011/8/13 1:20:00 Author:qqtang | Keyword: power supply, internal resistance, measuring circuit
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Published:2011/8/13 1:21:00 Author:qqtang | Keyword: single knot, transistor speed test circuit
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Published:2011/8/23 22:36:00 Author:qqtang | Keyword: mosquito dispeller
The electric mosquito dispeller circuit is shown in figure 1, which consists of the high frequency oscillator circuit, triple voltage rectifier circuit and high voltage shock net DW.
When the power supply switch SB is pressed, the high frequency oscillator, which consists of the triode VT and transformer T, is getting power and working, it switches the 3V DC into the 18kHz high frequency AC, then it is boosted to about 500V(which is got from the 2 terminals of L3) by T, and then it is boosted to 1500V by the diodes VD2~VD4 and capacitors C1~C3, the boosted voltage is added on the metal net DW. (View)
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Published:2011/8/13 1:29:00 Author:qqtang | Keyword: working pattens, single chip, phase difference, test system
The test patten basic connection circuit of the single chip wide frequency band phase difference test system of AD8302:
Comparator patten connection circuit:
Control patten connection circuit:
(View)
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Published:2011/8/23 22:24:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin
LM2984C--the multi-line output stabilizer (with reset terminal) This is a multi-line output stabilizer with fixed output voltage; it has main output, buffering output and affiliated output of tracking type; its main output voltage is 5V and current is 500mA; when the output current is 500mA, the minimum input-output voltage difference is lower than 0.8V; the buffering output voltage is 5V, output current is 100mA; when the output current is 100mA, the minimum input-output voltage is lower than 0.5V; the affiliated ouput-input voltage gap is 5V, output current is 7.5mA.
(View)
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Published:2011/8/28 3:13:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin
(View)
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Published:2011/8/23 22:26:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin
LP2950/2951 the high-precision stabilizer LP2950 is a 5V output 3-terminal regulator, LP2951 is a adjustable regulator whose output voltage range is 1.24~29V; the output current is 100mA; output voltage fault typical value is ±0.5%; load stability and linear stability typical value is 0.05%; when the output current is 100mA, the minimum input-output voltage difference typical value is 380mV; input voltage range is -0.3~+30V; it contains the current limitation and over-heat limitation circuit.
(View)
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Published:2011/8/12 10:43:00 Author:qqtang | Keyword: random system, output circuit
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Published:2011/8/13 0:29:00 Author:qqtang | Keyword: multi-system counter, selective switch
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Published:2011/8/13 0:46:00 Author:qqtang | Keyword: switch power supply, Hitachi
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Published:2011/8/13 0:57:00 Author:qqtang | Keyword: binary-coded decimal, counter
In the figure is a binary-coded decimal counter composed of 2 CD4017, one CD4066 and one CD4013, of which IC3 and IC4 are the counter, IC2 is used to connect the working power supply and counting pulse input circuit of IC3 and IC4, IC1 is used to control them. C1 and R2 compose the reset circuit of IC3 and the offset circuit of IC1. C2 and R3 compose the reset circuit of IC4. VD1 and VD2 are the divide diodes of the counter switch control circuit. (View)
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Published:2011/8/13 0:59:00 Author:qqtang | Keyword: counter, system
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Published:2011/8/13 1:00:00 Author:qqtang | Keyword: principle diagram, +60V
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